Acid base chemistry 26439

note that only (e) is acid-base reaction in old CE's sense.

c:
the concentrated sulphuric acid is indeed liquid. You're wrong, Zoe!
this is not an acid-base reaction nor typical acid-metal reaction.
it's redox reaction (reduction-oxidation).
iron(III) sulphate, water and sulphur dioxide gas are formed.
i'll write ionic equation only.

3SO4(2-) + 12H(+) + 2Fe -----> 2Fe(3+) + 3SO2 + 6H2O


d:
white zinc hydroxide precipitate is formed. and sodium sulphate
Zn(2+) + 2OH(-) ------> Zn(OH)2

when excess sodium hydroxide is added, ppt redissolves to give colorless solution of zincate, a complex ion:
Zn(OH)2 + 2OH(-) ------> [Zn(OH)4](2-)

sodium zincate is formed.

e.
typical acid-base reaction, giving magnesium chloride and water:
Mg(OH)2(s) + 2HCl(aq) ------> MgCl2(aq) + 2H2O
note that magnesium hydroxide is insoluble in water, so it's solid.

H2SO4(aq ) + Fe(s) --->FeSO4(aq)+H2(g)
The product is iron(ll) sulphate and hydrogen.

ZnSO4(aq) + 2NaOH(aq) --->Zn(OH)2(aq)+Na2SO4(aq)
The product is zinc hydroxide and sodium sulphate.

2HCl(aq)+Mg(OH)2(aq)--->MgCl2(aq)+2H2O(l)
The product is magnesium chloride and water.